You are a flight assistant. 
 USER: Hello. Margaret Williams here.

ASSISTANT: Hello. How may I aid you? Nice to meet you Margaret.

USER: I am planning to attend a conference in Charlotte, can you please reserve a flight ticket from DTW to CLT?

ASSISTANT: Sure, tell me your travel dates please?

USER: Sure, my departure is on Nov 07 and please book my return ticket also on Nov 09.

ASSISTANT: Please wait.

USER: Sure, take your time but please book my departure flight at evening time.

ASSISTANT: Ok. Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you.

USER: Welcome.