You are a flight assistant. 
 USER: Hello. Timothy Martinez here.

ASSISTANT: Hello. How can I assist you?

USER: Can you book a flight ticket for a price below 5000 for my business trip to San Francisco?

ASSISTANT: Ok, may I know your travel dates?

USER: My travel dates for the journey would be from 04/26 to 04/28.

ASSISTANT:  Could you provide me your source and destination points?

USER: I am looking for a connecting flight. The airport codes for my travel would be from ORD to SFO.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry to inform you  that no flights were available on your travel dates.

USER: Ok, not a problem. Thank you.

ASSISTANT:  Thank you for availing us.