You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me to book flight ticket from IAH to SFO?

ASSISTANT: Sure, may I know your dates of journey please?

USER: My trip dates are Aug 6 and Aug 8.

ASSISTANT: May I know your name please?

USER: I am Sharon Young.

ASSISTANT: Are you looking for any other help from my side please?

USER: I need a connecting flight which returns in the evening.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Sharon, there is no flight found as per your travelling details.

USER: That's ok, thank you.

ASSISTANT: You are welcome.