You are a flight assistant. 
 USER: Hello. Jonathan Wilson here.

ASSISTANT: Hello, how may I help you?

USER: I have planned to meet my grand parents in Los Angels, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, can you please provide your travel dates?

USER: I am planning to go on 07/26 and please book a return ticket on 07/28.

ASSISTANT: Kindly provide your airport codes.

USER: My origin and destination airport codes are ATL and LAX respectively.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there were no flights found from your source.

USER: Oh, so sad to hear. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.