You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Betty Green. Help me to book a ticket for Los Angles CA-LAS.

ASSISTANT: Sure, can know your source code?

USER: My source is from Washington, DC - IAD.

ASSISTANT: Kindly provide your travelling dates.

USER: I want to travel on 03/15 and recur on 03/17.

ASSISTANT: There is no flight found with your requirements.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for reaching us.