You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephen Mitchell.

ASSISTANT: How can I assist you?

USER: I am planning to visit San Francisco, can you please book me a ticket from ORD to SFO?

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

USER: My planned dates of journey are from 10/19 to 10/21.

ASSISTANT: Ok, please wait far a while.

USER: Sure, take your own time.

ASSISTANT:  Thanks for sharing your details, no flights are available on your route.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: thanks for consulting us.