You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Would you please help me in  booking a ticket from ORD to SFO.

ASSISTANT: When are you planning to make your journey?

USER: My planned travel dates are as follows Oct 12 and Oct 14.

ASSISTANT: Is there any connection limit for you?

USER: I would like to board a single connecting flight.

ASSISTANT: May I know your name?

USER: My name is Thomas Thompson.

ASSISTANT: Is there any another specifications on your trip?

USER: I have no more preferences.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Thomas Thompson, based on your required specifications we haven't found any flight in airline database.

USER: No issue, thank you for your time.