You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I aid you today?

USER: I want to book a flight ticket to my friend to attend my convocation at Charlotte. Will you help me in booking a ticket from DTW?

ASSISTANT: Sure, may I know your travelling days?

USER: Sure, Dates of journey are 09/23 to 09/25. There should be one connection.

ASSISTANT: To proceed further we need your destination airport codes.

USER: My destination airport code: CLT. The fare of the ticket should be 500.

ASSISTANT: To finalise with booking we need your name.

USER: My friends name is Angela Roberts.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for your patience. Sorry to inform you that there is no flights available with the given details.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.