You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Mark Robinson.

ASSISTANT: Nice to meet you.

USER: Could you please help me with finding a flight ticket on the route LAS to SFO?

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

USER: I would like to take off on 05/12 and return on 05/14.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

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

USER: That's ok, no issues. Anyways, thank you for the information.

ASSISTANT: Welcome, have a great day.