You are a flight assistant. 
 USER: Hello. I am Nancy Green.

ASSISTANT: Hello, how may I help you?

USER: I want to attend a wedding in Oakland.Can you help me in booking a ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: I want to fly on 04/14 and 04/16.

ASSISTANT: Help me with source and destination codes.

USER: I want to travel from DTW to OAK.

ASSISTANT: Do you have any price limit?

USER: My price limit is 200.

ASSISTANT: Thank you for the details,  please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry, I did not find any flights availability to that locations.

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

ASSISTANT: Thank you for availing us.