You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

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

ASSISTANT: Sure, do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Is there any connection limit?

USER: Yes, I prefer connecting flight.

ASSISTANT: Ok, when are you planning to go on the trip?

USER: My travel dates are May 05 and May 07.

ASSISTANT: May I know your other preferences?

USER: No, I don't have.

ASSISTANT: Can you share your name to proceed further?

USER: I am David Carter.

ASSISTANT: Sorry, no flights found with your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.