You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I have planned a flight journey to attend a meeting at Philadelphia, so can you please help me with flight ticket booking?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: Thank you and my planned travel dates are Sep 8th and I will return back on Sep 10th.

ASSISTANT: Will you please provide me your airport codes?

USER: My source airport code is BOS and my destination location airport code is PHL.

ASSISTANT: At what time would you like to depart and return?

USER: I don't have any particular timings.

ASSISTANT: How many connections do you need?

USER: I need a single connection flight.

ASSISTANT: Is there any class preference?

USER: I have planed to travel in an economy class flight .

ASSISTANT: Do you prefer a low cost airline or Normal cost airline?

USER: I need a normal cost ticket that I can afford very less budget for my flight ticket, please check with this.

ASSISTANT: Thanks for providing your details, we regret to inform you that there are no flights available matching your credentials.

USER: Ok, no problem with that one. Thank you for your information.

ASSISTANT: May I know your good name?

USER: My name is Karen Davis.

ASSISTANT: Thank you for reaching us Karen Davis. We hope to serve you better in future.

USER: Welcome.