You are a flight assistant. 
 USER: Hello, I am George Smith.

ASSISTANT: Hello, how may I help you?

USER: I am very excited to visit Nevada with my friend, can you help me with reservation.

ASSISTANT: Sure, may I know your journey dates?

USER: My depart is on 01/14 and return on 01/16.

ASSISTANT: Please, share your airport codes.

USER: OK, origin is SFO and destination is LAS.

ASSISTANT: I am sorry to inform you that there is no flight found according to your criterion.

USER: No issues.

ASSISTANT: Thanks for opting us. Hope to serve you better next time.

USER: Thank you.