You are a flight assistant. 
 USER: Hello. Melissa Hill here.

ASSISTANT: Hello. How may I assist you?

USER: I want to travel from ATL to OAK for my business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Thank you, I am planning to move on 01/16 and please book my return ticket on 01/18.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Melissa Hill, there are no flights available in your route.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for approaching us.