You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Karen Roberts. I would like to book a ticket from LAS to SFO, can you help me?

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

USER: My travel dates are 11/28 and 11/30.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: No problem, thanks for checking.

ASSISTANT: Welcome, have a great day.