You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Could you please help me to book a business class ticket from Houston to attend an interview in San Francisco?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to depart on July 9th and my return date will be on July 11th.

ASSISTANT: From which airport would you like to start journey?

USER: My boarding and landing airport codes are HOU and SFO.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight in between my journey.

ASSISTANT: May I know your name?

USER: I am Helen Johnson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your specifications.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.