You are a flight assistant. 
 USER: Hi. I am Catherine Rodriguez.

ASSISTANT: Hello, How can I help you?

USER: Will you assist me in booking a plane ticket to Phoenix, PHX to attend an emergency meeting with my client?

ASSISTANT: Sure, May I know the source code?

USER: My boarding point is Oakland, OAK.

ASSISTANT: Please help me with your travel dates.

USER: I will leave from my source on 09/22 and return on 09/24.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.