You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Robert Green.

ASSISTANT: How can I assist you today?

USER: I am planning to travel from ATL to CLT, help me in booking?

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

USER: My date of travelling is on 01/28 to 01/30.

ASSISTANT: Please give me a moment. There is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.