You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Walker.

ASSISTANT: How may I assist you?

USER: I am planning to attend my colleague ring ceremony at Phoenix PHX. Can you avail me a direct flight?

ASSISTANT: Sure, when are you planning to travel?

USER: My trip dates are 04/10 and 04/12.

ASSISTANT: Help me with the source code?

USER: My source code is Charlotte CLT.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for opting us. Hope to serve you again.