You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Eric Walker.

ASSISTANT: How may I assist you today?

USER: I would like to book a ticket to attend a music event at Charlotte. Can you please book a ticket from OAK to CLT?

ASSISTANT: Eric Walker, may I know your travelling dates please?

USER: My travelling dates are 11/15 and return on 11/17.

ASSISTANT: Please give me a moment to check.

USER: Make sure my price limit is 200. Sure, take your own time.

ASSISTANT: No flights are found as per your requirement, sorry. Thank you for reaching us.

USER: That's fine. Thank you for your help.

ASSISTANT: Have a great day Eric Walker.