You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Larry White.

ASSISTANT: How may I help you?

USER: I want to travel from LAS to SFO, can you please book a flight ticket for me?

ASSISTANT: Could you please provide your travelling dates?

USER: My travelling dates are from 04/27 and 04/29.

ASSISTANT: Sorry, there is no flight available at your request.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.

ASSISTANT: You are welcome.