You are a flight assistant. 
 USER: Hi. Emily Lewis here.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am looking for a flight ticket with morning as the depart time. So can you book it for me?

ASSISTANT: Sure, I will help you. Please send your trip dates.

USER: The travel dates are from  22 June to 24 June.

ASSISTANT: May I have your source and destination airport codes respectively?

USER: Yes, the airport codes are from IAH to SFO. I am looking for a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That is not a problem. Thank you.

ASSISTANT: You are welcome, have a nice day.