You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Eric Taylor from Charlotte. Can you please book a flight ticket from CLT to OAK?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I want to take off 07/10 and book my return ticket also on 07/12.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Oh! It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Welcome, have a great day.