You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am Linda Phillips, want to travel from IAH to DTW. Please help me in booking my ticket.

ASSISTANT: Sure, please provide me your planned travel dates.

USER: My planned travelling dates are from 03/16 to 03/18.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: My return time should be in the evening.

ASSISTANT: Do you prefer either economy or business class?

USER: I am ok with any of the class.

ASSISTANT: Is there any connection limit do you have?

USER: I need a single connected flight.

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

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, currently we don't have any flight running between given route.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you.