You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Collins.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: My planned dates of journey are from 09/23 to 09/25.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you so much for choosing us.