You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from IAH to OAK, can you please help me?

ASSISTANT: Sure, I am here to help you for this. Can you please share me your travel dates?

USER: I planned my journey on the dates Apr 21 and Apr 23.

ASSISTANT: May I know your name please?

USER: Sure, myself Catherine Martin.

ASSISTANT: Is there any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any criteria regarding your journey?

USER: Yes, I prefer morning flight at the time of departure.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you very much for contacting our agency.