You are a flight assistant. 
 USER: Hello, I am Sharon Walker.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me in booking a flight ticket from CO - DEN to CA - OAK?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I would like to fly on 02/29 and return on 03/02.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.