You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of service your looking for?

USER: I am planning to attend music concert at LGA, can you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, please share me your good name.

USER: My name is Daniel Garcia.

ASSISTANT: Is there any time concern for you?

USER: I am comfortable with any timings, but I prefer business class.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I have already mentioned above.

ASSISTANT: May I know your travel dates?

USER: I would like to take off on Aug 10 and return on Aug 12.

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

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.