You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, let me know your name to check further?

USER: I am Laura Evans.

ASSISTANT: Found reservation, can you mention your new airport codes?

USER: I need to travel from SFO to EWR in normal cost airlines.

ASSISTANT: When are you planning to travel now?

USER: My trip dates are 07/29 and 07/31.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight and return time in evening.

ASSISTANT: Sorry, no flights found as per your requirements.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us.