You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Catherine Mitchell here. I want to attend my sister marriage anniversary, can you please search a flight with single connection?

ASSISTANT: Sure, I will help you to search a flight. Can you please provide me your travelling dates?

USER: I will start my journey on 07/15 and my return will be on 07/17.

ASSISTANT: Ok, may I know your airport codes?

USER: These are my travelling airport codes IAH and SFO.

ASSISTANT: Ok, give me a moment.

USER: Ok, take your time.

ASSISTANT: As per your given travelling dates, there is no flight is available for you.

USER: Not an issue. Thank you for checking.

ASSISTANT: Ok. Welcome. Thank you for choosing us.