You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dennis Harris.

ASSISTANT: Dennis Harris. How can I help you?

USER: I am planning to visit San Francisco, will you help me in booking the flight ticket from PHX to SFO?

ASSISTANT: May I know the itinerary travel dates?

USER: My travelling dates are July 26 and July 28.

ASSISTANT: Do you have any class preferences?

USER: I am comfortable in any class.

ASSISTANT: Is there any time concern.

USER: My depart time must be in morning.

ASSISTANT: Do you have any connection limits?

USER: I need a flight with single connection.

ASSISTANT: Do you have any airline preferences?

USER: No, thank you for asking.

ASSISTANT: Are there any other preferences you wish to avail?

USER: No, you can check with the above preferences.

ASSISTANT: Give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: I regret to inform that there are no flights with your preferences.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.