You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carolyn Nelson.

ASSISTANT: Nelson, how can I help you today?

USER: I am looking for a flight from SFO to ORD, can you render me in booking the flight ticket for me?

ASSISTANT: Sure, please tell me your travel dates.

USER: My journey dates are from 05/20 till 05/22.

ASSISTANT: Ok, wait for a moment.

USER: Sure.

ASSISTANT: Sorry Nelson, no flight is available for you on your route.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.