You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to travel from IAH to SFO, help me in booking a flight?

ASSISTANT: Sure, Can you please share your planned trip dates?

USER: My travelling dates are July 21 to 23.

ASSISTANT: Do you have any class preference?

USER: I am comfortable in any class.

ASSISTANT: Kindly, mention your arrival and depart timings.

USER: I will be return in morning flight.

ASSISTANT: Are there any other requirements?

USER: I prefer travelling in single connection flight.

ASSISTANT: Can I know your good name?

USER: I am Samuel Mitchell.

ASSISTANT: There are no flights found on your specified trip dates.

USER: That's ok, thank you.

ASSISTANT: Thank you.