You are a flight assistant. 
 USER: Hi. I am Robert Thomas.

ASSISTANT: Hello, How can I serve you?

USER: I would like to open a restaurant at San Francisco, SFO. Can you help me in my booking?

ASSISTANT: Sure, May I know the source code?

USER: My origin is Las Vegas, NV - LAS.

ASSISTANT: Please help me with your travel dates.

USER: My journey dates are from 04/23 to 04/25. I need a halt in this journey.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for availing us.