You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Campbell.

ASSISTANT: How may I aid you?

USER: Can you please book a flight ticket from EWR to OAK?

ASSISTANT: Sure, on which dates you are planning to travel?

USER: Sure, I need to travel on dates of 12/10 and 12/12.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight available.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Most welcome.