You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Amanda Thompson want to visit Chicago, can you book a ticket from SFO to ORD?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Sure, my travelling dates will be 06/19 and 06/21.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.