You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Robert Taylor, want to travel from IAH to PHL. Please help me in booking my ticket.

ASSISTANT: Sure, I am here to help you. Please share your travelling dates.

USER: My travelling dates are from 03/04 to 03/06.

ASSISTANT: Do you need any connection in between the journey?

USER: No, I need a direct flight.

ASSISTANT: Ok, please share your class preference.

USER: No, there is no class preference.

ASSISTANT: Please let me know if you have any other specifications.

USER: My return time will be in evening.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no flights found with your details.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us, have a good day.