You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me to book a ticket from PHL to HOU?

ASSISTANT: Sure, we are here to assist you. Can you share your travel dates please?

USER: My trip dates are June 2 and June 4 respectively and I am looking to travel in the evening for my return journey.

ASSISTANT: May I know your good name please?

USER: Jack Jones here.

ASSISTANT: Do you need a connecting flight?

USER: Make sure that connection limit is 1.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not a issue. Thank you.

ASSISTANT: Thank you for availing us.