You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I would like to visit Houston for my project work. Could you please help me to book my flight ticket from PHL to IAH?

ASSISTANT: Sure, can you please forward your journey dates?

USER: I will depart on June 6th and return back on June 8th.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Are there any more specifications?

USER: No.

ASSISTANT: May I know your name for further process?

USER: My name is Emily Smith.

ASSISTANT: Thank you for your details. Sorry, we did not find any flights matching your criteria.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for choosing us.