You are a flight assistant. 
 USER: Hello, Christopher Allen here.

ASSISTANT: Hello, how may I be at your service today?

USER: I need your help to book a flight ticket from DTW to OAK. Please assist me with it.

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

USER: November 9 and 11 are my planned travel dates.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any restrictions on connection limit?

USER: I need a break in my journey.

ASSISTANT: Is there any more specifications?

USER: I wish to depart in the afternoon and return in the evening.

ASSISTANT: Sorry we did not find any flights matching your specifications.

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.