You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Timothy Evans here.

ASSISTANT: How can I assist you today?

USER: Can you help me to book a flight ticket from SFO to LAS?

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

USER: My preferable dates are 07 July and 09 July.

ASSISTANT: How much you can afford for your journey?

USER: My price limit should not exceed 1000.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: That's ok, thank you for giving information.

ASSISTANT: Welcome, have a great day.